Invalid (old?) table or database

In my log messages I see

mariadbd[891]: 2026-06-23 22:20:47 779 [ERROR] Invalid (old?) table or database name '.ssh'

What should be done?

Which version of MariaDB are you running?
Can you look in /var/lib/mysql/ and see if there is an errant .ssh directory there (which shouldn't be there!)
If it's there, delete it (or move it elsewhere to examine it) -- it could be an IOC from the recent wave of hacks.